c – 在将对象传递给函数时,我必须重载哪些运算符才能查看所有操作？

我想编写一段代码,显示在将对象传递给函数时对对象执行的所有复制/赋值/删除等操作.

我写了这个：

#include <iostream>

class A {
    public:
        A(){std::cout<<"A()"<<std::endl;}
        void operator=(const A& a ){std::cout<<"A=A"<<std::endl;}
        A(const A& a){std::cout<<"A(A)"<<std::endl;}
        ~A(){std::cout<<"~A"<<std::endl;}
};

void pv(A a){std::cout<<"pv(A a)"<<std::endl;}
void pr(A& a){std::cout<<"pr(A& a)"<<std::endl;}
void pp(A* a){std::cout<<"pp(A* a)"<<std::endl;}
void pc(const A& a){std::cout<<"pc(const A& a)"<<std::endl;}

int main() {
    std::cout<<" -------- constr"<<std::endl;
    A a = A();
    std::cout<<" -------- copy constr"<<std::endl;
    A b = A(a);
    A c = a;
    std::cout<<" -------- assignment"<<std::endl;
    a = a;    
    a = b;
    std::cout<<" -------- pass by value"<<std::endl;
    pv(a);
    std::cout<<" -------- pass by reference"<<std::endl;
    pr(a);
    std::cout<<" -------- pass by pointer"<<std::endl;
    pp(&a);
    std::cout<<" -------- pass by const reference"<<std::endl;
    pc(a);
    return 0;
}

我忘了什么吗？
在比较传递对象的不同方式时还有什么必须考虑的吗？

解决方法:

在C 11中,您应该添加右值参考：

A(A&&);
void operator=(A&& a );

标签：c,operator-overloading,pass-by-reference,pass-by-value,pass-by-pointer
来源： https://codeday.me/bug/20191003/1847432.html